Loch Noir is apparently not "Black Loch" in French, but Gaelic for "Loch of the Rushes" (Loch nan Luachar in modern Gaelic, possibly Loch na Luachra in old Gaelic, as it would be in modern Irish). From some of the photos it seems to be well named, as the growth of rushes and reeds is slowly choking the open water and if the process continues it will eventually transform into a rushy swamp.